非饱和公路路基填料长期动力特性试验研究

doi:10.13722/j.cnki.jrme.2018.0274

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摘要为研究非饱和路基粗粒填料长期动力特性，对GDS大型三轴试验系统进行非饱和测试模块升级，并选取浙江省某路基采石场碎石填料进行试验研究。掺入质量比3%的高岭土来模拟受细粒污染的路基填料层，基质吸力通过轴平移法进行控制。对凝灰岩碎石混合料在2种循环偏应力幅值和4种初始基质吸力下进行大次数循环加载试验，分析非饱和路基中初始基质吸力对凝灰岩碎石填料轴向累积变形和回弹模量的影响。试验发现，凝灰岩碎石混合料试样在持水试验中存在滞回现象，同一基质吸力试样在干化路径下对应的含水率明显大于湿化路径。在循环荷载作用下，非饱和路基填料的回弹模量随初始基质吸力的增加而增大，且在较小基质吸力(0～30 kPa)范围时，基质吸力对回弹模量影响较大，而在较大基质吸力(30～90 kPa)范围时，基质吸力增加对回弹模量影响减弱。非饱和路基填料的累积轴向变形随基质吸力的增加而减小，其减小速率也随基质吸力的增大而降低；轴向累积变形与基质吸力非线性相关，而与含水率线性相关。

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	陈靖宇1
	蔡袁强1
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	曹志刚1
	李富有3
	谷川4

关键词 ：土力学, 非饱和大型三轴试验, 凝灰岩碎石混合料, 基质吸力, 交通荷载, 长期动力特性

Abstract：The large-scale triaxial apparatus GDS was upgraded with an unsaturated testing module to study the long-term dynamic characteristics of unsaturated road base and subbase materials. The testing materials were taken from a common quarry in Zhejiang Province and mixed with kaolin at a mass ratio 3% to simulate the actual road base and subbase materials. During the tests，the axis-translation method was used to control the matric suction. A series of large-scale cyclic triaxial tests were conducted on the crushed tuff aggregate mixtures under four initial matric suctions and two cyclic stress amplitudes. Special attention was paid to the effects of the initial matric suction on the accumulated axial strain and resilient modulus. The testing results indicate that the soil-water characteristic curve(SWCC) of the unsaturated materials presents a hysteresis phenomenon in the water retention tests. For the same matric suction，the moisture content in the drying path is higher than that in the wetting path. Under cyclic loadings，the resilient modulus increases with the increasing of matric suction. The influence of initial matric suction on resilient modulus is more obvious at smaller matric suctions(0–30 kPa) than at larger matric suctions. The accumulated axial strain decreases with the increasing of matric suction，and the decreasing rate also declines with the increasing of matric suction. A nonlinear relationship exists between the accumulated axial strain and matric suction，and a linear relationship exists between the accumulated axial strain and moisture content.

Key words： soil mechanics unsaturated large-scale triaxial tests crushed tuff aggregate mixtures matric suction traffic loading long-term dynamic characteristics

引用本文:

陈靖宇1，蔡袁强1，2，曹志刚1，李富有3，谷川4. 非饱和公路路基填料长期动力特性试验研究[J]. 岩石力学与工程学报, 2018, 37(10): 2406-2414.
CHEN Jingyu1，CAI Yuanqiang1，2，CAO Zhigang1，LI Fuyou3，GU Chuan4. Experimental research on long-term dynamic characteristics of unsaturated road base and subbase mixtures. , 2018, 37(10): 2406-2414.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0274 或 http://www.rockmech.org/CN/Y2018/V37/I10/2406

[2]	TRINH V N，TANG A M，CUI Y J，et al. Mechanical characterization of the fouled ballast in ancient railway track substructure by large- scale triaxial tests[J]. Soils and Foundations，2012，52(3)：511-523.
[3]	ISHIKAWA T，FUKU S，NAKAMURA T，et al. Influence of water content on shear behavior of unsaturated fouled ballast[J]. Procedia Engineering，Advance in Transportation Geotechnics，2016，143：268-275.
[5]	HEATH A C，PESTANA J M，HARVEY J T，et al. Normalizing behavior of unsaturated granular pavement materials[J]. Journal of Geotechnical and Geoenvironmental Engineering，ASCE，2004，130(9)：896-904.
[6]	YANG S R，LIN H D，KUNG J H S，et al. Suction-controlled laboratory test on resilient modulus of unsaturated compacted subgrade soils[J]. Journal of Geotechnical and Geoenvironmental Engineering，ASCE，2008，134(9)：1 375-1 384.
[8]	SIVAKUMAR V，KODIKARA J，O'HAGAN R，et al. Effects of confining pressure and water content on performance of unsaturated compacted clay under repeated loading[J]. Géotechnique，2013，63(8)：628-640.
[16]	CRACIUN O，LO S C R. Matric suction measurement in stress path cyclic triaxial testing of unbound granular base materials[J]. Geotechnical Testing Journal，2009，33(1)：1-12.
[18]	蔡袁强，赵莉，曹志刚，等. 不同频率循环荷载下公路路基粗粒填料长期动力特性试验研究[J]. 岩石力学与工程学报，2017，36(5)：1 238-1 246.(CAI Yuanqiang，ZHAO Li，CAO Zhigang，et al. Experimental study of dynamic characteristics of unbound granular materials under cyclic loading with different frequencies[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(5)：1 238- 1 246.(in Chinese))
[26]	INAM A，ISHIKAWA T，MIURA S. Effect of principal stress axis rotation on cyclic plastic deformation characteristics of unsaturated base course material[J]. Soils and Foundations，2012，52(3)：465-480.
[1]	DUONG T V，CUI Y J，TANG A M. Effects of water and fines contents on the resilient modulus of the interlayer soil of railway substructure[J]. Acta Geotechnica，2016，11(1)：51-59.
[4]	ZHANG L M，LI X，FREDLUND D G. SWCCs and permeability functions for coarse-grained soils[C]// Proceeding of the International 4th Asia-Pacific Conference on Unsaturated Soils. Newcastle，Australia：[s. n.]，2009：251-256.
[11]	GABR A R，MILLS K G，CAMERON D A. Repeated load triaxial testing of recycled concrete aggregate for pavement base construction[J]. Geotechnical and Geological Engineering，2013，31(1)：119-132.
[14]	NG C W W，PANG Y W. Influence of stress state on soil-water characteristics and slope stability[J]. Journal of Geotechnical and Geoenvironmental Engineering，2000，126(2)：157-166.
[21]	MEILANI I，RAHARDJO H，LEONG E，et al. Mini suction probe for matric suction measurements[J]. Canadian Geotechnical Journal，2002，39(6)：1 427-1 432.
[24]	李翀，何昌荣，王琛，等. 粗粒料大型三轴试验的尺寸效应研究[J]. 岩土力学，2008，29(增1)：563-566.(LI Chong，HE Changrong，WANG Chen，et al. Study of scale effect of large-scale triaxial test of coarse-grained materials[J]. Rock and Soil Mechanics，2008，29(Supp.1)：563-566.(in Chinese))
[9]	CERNI G，CARDONE F，VIRGILI A，et al. Characterization of permanent deformation behaviour of unbound granular materials under repeated triaxial loading[J]. Construction and Building Materials，2012，28(1)：79-87.
[19]	CAI Y，CHEN J，CAO Z，et al. Influence of grain gradation on permanent strain of unbound granular materials under low confining pressure and high-cycle loading[J]. International Journal of Geomechanics，ASCE，2018，18(3)：04017156.
[7]	NG C W W，ZHOU C，YUAN Q，et al. Resilient modulus of unsaturated subgrade soil：experimental and theoretical investigations[J]. Canadian Geotechnical Journal，2013，50(2)：223-232.
[10]	CAO Z，CHEN J，CAI Y，et al. Effects of moisture content on the cyclic behavior of crushed tuff aggregates by large-scale tri-axial test[J]. Soil Dynamics and Earthquake Engineering，2017，95：1-8.
[12]	RAHMAN M S，ERLINGSSON S. Moisture influence on the resilient deformation behaviour of unbound granular materials[J]. International Journal of Pavement Engineering，2016，17(9)：763-775.
[13]	AZAM A M，CAMERON D A，RAHMAN M M. Permanent strain of unsaturated unbound granular materials from construction and demolition waste[J]. Journal of Materials in Civil Engineering，2014，27(3)：1-12.
[15]	EKBLAD J，ISACSSON U. Influence of water on resilient properties of coarse granular materials[J]. Road Materials and Pavement Design，2006，7(3)：369-404.
[17]	ISHIKAWA T，ZHANG Y，TOKORO T，et al. Medium-size triaxial apparatus for unsaturated granular subbase course materials[J]. Soils and Foundations，2014，54(1)：67-80.
[20]	殷建华. 新双室三轴仪用于非饱和土体积变化的连续测量和三轴压缩试验[J]. 岩土工程学报，2002，24(5)：552-555.(YIN Jianhua. A new double cell triaxial system for continuous measurement of volume changes of an unsaturated or saturated soil specimen in triaxial test[J]. Chinese Journal of Geotechnical Engineering，2002，24(5)：552-555.(in Chinese))
[22]	中华人民共和国行业标准编写组. JTG D30—2015公路路基设计规范[S]. 北京：人民交通出版社，2015.(The Professional Standards Compilation Group of People?s Republic of China. JTG D30—2015 Code for design of highway subgrades[S]. Beijing：China Communications Press，2015.(in Chinese))
[23]	中华人民共和国行业标准编写组. SL237—1999土工试验规程[S]. 北京：中国水利水电出版社，1999.(The Professional Standards Compilation Group of People?s Republic of China. SL237—1999 Specification of soil test[S]. Beijing：China Water Power Press，1999.(in Chinese))
[25]	张龙，陈正汉，周凤玺，等. 非饱和土应力状态变量试验验证研究[J]. 岩土工程学报，2017，39(2)：380-384.(ZHANG Long，CHEN Zhenghan，ZHOU Fengxi，et al. Test verification of stress state variables for unsaturated soils[J]. Chinese Journal of Geotechnical Engineering，2017，39(2)：380-384.(in Chinese))